Python ord() Function

The Python ord() function takes a character (=string of length one) as an input and returns the Unicode number of this character. For example, ord(‘a’) returns the Unicode number 97. The inverse function of ord() is the chr() function, so chr(ord(‘a’)) returns the original character ‘a’. Here are three examples of passed Unicode characters transformed … Read more

Python Join Arguments and String Concatenation

Problem: Write a function that joins an arbitrary number of string arguments with a given separator. Example: Given the string arguments “A”, “B”, and “C” and the string separator “-“. Join them to the concatenated string “A-B-C”. Solution: The following code creates a Python function concat() that takes an arbitrary number of arguments, packs them … Read more

Python exec() — A Hacker’s Guide to A Dangerous Function

Python’s exec() function executes the Python code you pass as a string or executable object argument. This is called dynamic execution because, in contrast to normal static Python code, you can generate code and execute it at runtime. This way, you can run programmatically-created Python code. Have you ever wondered about the limits of a … Read more

String Slicing in Python

String slicing is a concept to carve out a substring from a given string. Use slicing notation s[start:stop:step] to access every step-th element starting from index start (included) and ending in index stop (excluded). All three arguments are optional, so you can skip them to use the default values (start=0, stop=len(string), step=1). For example, the … Read more

Why Slicing With Index Out Of Range Works In Python?

Python slicing means to access a subsequence of a sequence type using the notation [start:end]. A little-known feature of slicing is that it has robust end indices. Slicing is robust even if the end index is greater than the maximal sequence index. The slice just takes all elements up to the maximal element. If the … Read more

Python String Concatenation Without ‘+’

When I first saw this, I was sure it’s a bug. Well—it’s a feature! In today’s short article, you’ll learn about a small Python trick that I call “string concatenation without +”. Let’s start with some code! Plus vs. Adjacent String Literal Concatenation There are two ways to concatenate string literals in Python: Using the … Read more

String Concatenation – An Interactive Guide

Python has powerful built-in capabilities for string manipulation. That’s why web companies like Google love Python—it’s a perfect fit for the text-based web. This guide shows you how to use string concatenation operators using multiple forms of education: Text Puzzle Video Exercise Ready to learn string concatenation? Let’s get started! A Textual Introduction to String … Read more

Python Regex Finditer()

You can create an iterable of all pattern matches in a text by using the re.finditer(pattern, text) method: Specification: re.finditer(pattern, text, flags=0) Definition: returns an iterator that goes over all non-overlapping matches of the pattern in the text. The flags argument allows you to customize some advanced properties of the regex engine such as whether … Read more